Adjusting means for sewing-machine work supports



MM. 20, w23. 1,448,731

' C. DEARBORN ADJUSTING MEANS FOR* SEWING MACHINE WORK SUPPORTS Filed. May 17, 1921 Patented Mar. 29, 1923. l l

l attain Ararat ortica.,

CHARLES A. DEARBORN, OF NEW YORK, N. Y.

.ADJY'STING MEANS FOR SWING-MACHINE WORK SUPPORTS.

Application filed May 17, 1921. Serial-Nc. 470,287.

To all whom zt may concern: l

Be it known that I, CHARLES A. DEAR- BoRN, a citizen of the United States, residing in the borough of Manhattan, city, county, and State of New York, have invented certain new and useful Improvements in Adjusting Means for Sewing-Machine Work Supports, of which the following is a specification.

The present invention relates to improved means for conveniently and accurately adjusting the pivoted work support of ablind stitch sewing machine of the type illustrated in Patent No. 814,026 granted to me March 6th, 1906. In this type of sewing machine, the'work is passed over a pivotally mounted work support or table that holds the work in engagement with the under face of astationary presser foot in proper relation to the feeding and stitch forming mechanisms. It is essential in this type of machine to maintain an accurate adjustment of the work support with relation to the stationary presser foot land because of the varyingl character, of some classes of work, it is some times necessary for the operator to change the adjustment of the work support in the midst of a sewing operation. The purpose ofthe present invention is to afford convenient meansl for rapidly and accurately correcting the adjustment of the work support. To this end, the present invention consists of a hand operated adjusting screw mounted in the machine frame and engaging a part projecting from the pivoted work supportk and a spring actuated pin or dog mounted in the machine frame and engaging a recessed 'collar upon the adjusting screw to retain the screw in the desired positionv against accidental displacement.`

In order 'that the invention may be fully understood, it will now be described with reference to the accompanying drawing. In said drawing Figure l is a side elevation of the forward part f a blind stitch sewing machine having my improved adjusting devices applied thereto. j

Figure 2"is a vertical, sectional view of a part of the same on a slightly larger scale, showin the details of said devices.

1 is tIie base of the sewing machine, from which rises the auxiliary arm 30 in the upper end of which is pivoted at 34 the horizontal, forwardl extending work supporting frame 40. urrounding the pivot shaft 34 is a torsion spring whose opposite ends engage respectively .the flange 40aof the frame 40 and the hook rod 46 which ypasses through the machine arm 30 and has its threaded, forward end engaged by a wing nut 48.

The'work support 40 has an integral, downwardly projecting arm 41 which is engaged at its lower end by an adjusting screw 49 .which isi threaded through the auxiliary arm 30 and is provided at its exposed outer Vend with a milled head 50 by which the screw 49 can be readily adjusted for causing the' j, Y

work support 40 to move upon its pivot. Adjacent to the'milled hand wheel 50 is a rigidly attached crown wheel or collar formed in its edge with a series of slightly indented, curved recesses 56 which are engaged by the curved outer end 57 of the spring'actuated pin or do 58. The pin or dog 58 is seated in a cy indrcal bore 5 9 formed in the machine arm 30 above and parallel with the threaded socket of the screw 49. The pin 58 is formed with a rearwardl ro'ectin ide rod 60 which guides in thg Icylilndriciailglli)ore 61 of the hollow screw 62 threaded in the rear end of the socket 59 and held in the desired adjusted position by a lcck nut 63. An expansion spiral spring 65 surrounds the guide rod 60 and is confined between the adjustable hollow screw 62 and the shoulder at the rear of the pin or dog 58. The adjustment of screw 62 regulates the spring pressure ef the pin or dog 58 in its engagement with the crown wheel 55. It will be observed that,

while the machine isin operation, the operator can easily and quickly turnthe adjusting screw 49 for raising or lowering the work support to obtain the desired relationship between the work and the needle. The

spring actuated pin or dog 58 retains y projecting fnom saidl work support, an adjusting screw mounted in saidframe and engaging said rigid arm for limiting the adjusting screw threaded in said frame and engaging said arm, a recessed collar carried by said adjusting screw, a pin or dog mounted in a recess in said frame and engaging said recessed collar, said pin or dog having a rearwardly projecting guide pin, a hollow screw threaded in the frame recess in rear of said pin or dog and engaging said guide pin and a spring surrounding said guide pin and confined between said pin or dog and said hollow screw.

CHARLES A. DEARBORN. 

